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Originally Posted by Tricky
I would guess at the PSU, my mothers blows about every 9 months (god knows what shes doing!) and her light stays on on the motherboard. Go spend £20 (MAX) on a new PSU and get installing (some dealers will let you take em back if it wasn't that).
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£20 max! No wonder they only last 9 months.
When designing a power supply, it is common to put in something called a crowbar to protect the outputs. This simple circuit measures the output voltage and if, for any reason, it gets too high it tries to short-circuit the output. Of course, if you're designing down to a price then you forget about the crowbar. Which is fine until the day you get a spike down the mains, the output jumps and then takes out some of the electronics. This happened to my brother and it permanently zapped his hard disk drive
I would never skimp on the PSU.